I wish Riot stomped out 3rd party sites giving you a ton of info on your enemy team 3+ years ago
When this was being debated, the fact was, if you knew exactly the runes/masteries and how frequently people use that champion and that would give you a clear advantage, just for doing something during the loading screen
Now we have sites what lable you with certain accolades like "hot streaks" (good for trolls) and "i play this champion really well/badly" or even "on tilt" if you are having a bad day I don't like using these sites, because I prefer the fact that the game was intended to match you against 5 players you never played against and use what you know to defeat them, now people go on these sites and get every bit of information they can about them to best the enemy and I can't blame people for doing it as it's very easy to just load up a page and type your username but for players who don't use them and don't even know about them, those people are at a clear disadvantage
I often ponder what would have happened if Riot didn't allow these sites to mine information about your enemy team...